Try to use your monthly 100PV order to use for products you can use for incentives for enrollments or samples when sharing.
Keep your monthly spending at 100PV, even if there is a special or promo. You have to order 100PV each month anyway, so you can always purchase those items you missed out on for the next month.
In the end, all you need is your oils for people to sample, and a book to be the expert. Try not to go overboard in classes with large expensive presentations.
Use a spreadsheet to keep track of your doTERRA expenses. Divide them into NEEDS & EXTRA. This will help remind you that you need to cut back on the extra spending that can happen when you own a business:)